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Explanatory notes

Explanatory notes

Derived fertility measures

All fertility measures except number of children born alive, fertility ratio, registered live births and registered confinements are derived variables. They use births registered to women resident in New Zealand, in combination with resident population estimates and/or number of children born alive data. This process for deriving these fertility measures currently ensures consistency of numerator and denominator as defined by best practice. Best practice for ensuring consistency of numerator and denominator can vary over time and between sub-populations. It is not described in this standard.

Where fertility measures are based solely on census data, the residual categories of don't know, object to answering, response unidentifiable, response outside scope and not stated (of the number of children born alive variable) are to be excluded from the derived measures.

Stillbirths

The Births, Deaths and Marriages Registration Act 1995 which took effect from 1 September 1995 redefined what constituted a stillbirth. Before the new Act, stillbirths were defined as children born dead after 28 weeks of gestation. Under the current definition, children are stillborn if they are born dead and weigh 400g or more at birth, or are born dead after the twentieth week of pregnancy. This change in definition means that stillbirths from September 1995 onwards are not directly comparable with earlier years.

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